US6371150B1 - Flow dividing valve - Google Patents

Flow dividing valve Download PDF

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Publication number
US6371150B1
US6371150B1 US09/514,350 US51435000A US6371150B1 US 6371150 B1 US6371150 B1 US 6371150B1 US 51435000 A US51435000 A US 51435000A US 6371150 B1 US6371150 B1 US 6371150B1
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US
United States
Prior art keywords
flow
flow rate
spool
ratio
setting
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
US09/514,350
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English (en)
Inventor
Yoshiyuki Shimada
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Caterpillar SARL
Original Assignee
Shin Caterpillar Mitsubishi Ltd
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Publication date
Application filed by Shin Caterpillar Mitsubishi Ltd filed Critical Shin Caterpillar Mitsubishi Ltd
Assigned to SHIN CATERPILLAR MITSUBISHI LTD. reassignment SHIN CATERPILLAR MITSUBISHI LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: SHIMADA, YOSHIYUKI
Application granted granted Critical
Publication of US6371150B1 publication Critical patent/US6371150B1/en
Assigned to CATERPILLAR JAPAN LTD. reassignment CATERPILLAR JAPAN LTD. CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: SHIN CATERPILLAR MITSUBISHI LTD.
Assigned to CATERPILLAR S.A.R.L. reassignment CATERPILLAR S.A.R.L. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: CATERPILLAR JAPAN LTD.
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • F15B13/022—Flow-dividers; Priority valves
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/2496—Self-proportioning or correlating systems
    • Y10T137/2559—Self-controlled branched flow systems
    • Y10T137/265—Plural outflows
    • Y10T137/2668—Alternately or successively substituted outflow
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/2496—Self-proportioning or correlating systems
    • Y10T137/2559—Self-controlled branched flow systems
    • Y10T137/265—Plural outflows
    • Y10T137/2668—Alternately or successively substituted outflow
    • Y10T137/268—Responsive to pressure or flow interruption
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/2496—Self-proportioning or correlating systems
    • Y10T137/2559—Self-controlled branched flow systems
    • Y10T137/265—Plural outflows
    • Y10T137/2668—Alternately or successively substituted outflow
    • Y10T137/2693—Pressure responsive

Definitions

  • the present invention relates to a flow dividing valve. More specifically, the invention relates to a flow dividing valve capable of freely setting the ratio of flow rates for dividing the fluid in an inlet port into a plurality of outlet ports.
  • a flow dividing valve is capable of dividing the fluid in an inlet port into a plurality of outlet ports at a predetermined ratio of flow rates irrespective of the pressures in the outlet ports. This enables, accordingly, a stable flow rate to be fed to the hydraulic actuators in a plurality of systems by using a single oil hydraulic pump, making it possible to simplify the circuit and to decrease the cost of the apparatus.
  • This flow dividing valve is used for actuating an operation apparatus equipped with hydraulic actuators and for actuating an attachment fitted to the operation apparatus in, for example, a construction machine by the fluid discharged from a single hydraulic pump.
  • the flow dividing valve generally designated at a numeral 20 includes a flow rate control spool 24 inserted in a valve body 22 , and a needle 26 provided in a flow passage communicated with an inlet port P of the valve body 22 to form a throttle.
  • the flow rate control spool 24 is inserted in a spool slide hole 22 a formed in the valve body 22 to freely slide therein, and is pushed, by a compression spring 25 arranged on one end side (left end side in FIG. 3) of the low rate control spool 24 , against the side of the other end thereof.
  • the spool slide hole 22 a communicates with the inlet port P, an outlet port A and an outlet port B.
  • the flow rate control spool 24 slides in the spool slide hole 22 a due to a pressure difference between the upstream side and the downstream side, which is determined by the opening degree of the needle 26 , whereby the openings to the outlet port A and to the outlet port B are adjusted and accordingly, the flow is adjusted and divided.
  • the pressures change in the outlet port A and in the outlet port B the flow rates to these ports through the flow rate control spool 24 undergo a change depending on a change in the pressure difference before and after passing through the flow rate control spool 24 . Consequently, the flow rate of the fluid flowing into the needle 26 changes to cause a change in the pressure difference between the upstream side and the downstream side of the needle 26 .
  • the flow rate control spool 24 so slides as to maintain a predetermined ratio of flow rates despite of changes in the pressures in the outlet port A and in the outlet port B. Accordingly, the ratio of flow rates in the outlet port A and in the outlet port B is determined by the throttle opening degree of the needle 26 .
  • the above-mentioned conventional flow dividing valve involves the following problem that must be solved. That is, the ratio of flow rates is manually set by adjusting the opening degree of the needle, making it difficult to instantaneously and arbitrarily accomplish the setting in accordance with the operating amount of the operation lever as desired by an operator. It has therefore been desired to provide a flow dividing valve capable of instantaneously changing the ratio of flow rates.
  • the present invention has been accomplished in view of the above-mentioned fact, and its technical subject is to provide a flow dividing valve which enables the ratio of flow rates to be instantaneously and continuously set so that the fluid in the inlet port can be divided at a predetermined ratio of flow rates to a plurality of outlet ports.
  • a flow dividing valve for dividing the fluid in an inlet port into a plurality of outlet ports irrespective of the pressures in the outlet ports, comprising:
  • a flow rate control spool for dividing the flow rate of the fluid in said inlet port into a predetermined ratio of flow rates
  • a flow rate ratio-setting spool for setting said ratio of flow rates to control said flow rate control spool, said flow rate ratio-setting spool being operated by a control signal from an external unit.
  • the ratio of flow rates is set by operating, by means of a control signal, the flow rate ratio-setting spool that controls the flow rate control spool.
  • the ratio of flow rates can be continuously set to an arbitrary value.
  • a pilot hydraulic pressure is used as said control signal.
  • the flow rate ratio-setting spool is provided with a variable throttle that is adjusted by said control signal.
  • the ratio of flow rates is instantaneously and continuously set to an arbitrary value by the control signal.
  • the ratio of flow rates is instantaneously set in accordance with the magnitude of the pilot hydraulic pressure that is the control signal. Further, the ratio of flow rates is set depending on the throttle opening degree of the variable throttle that is adjusted by the control signal.
  • FIG. 1 is a sectional view of a flow dividing valve constituted according to the present invention
  • FIG. 2 is a diagram of a characteristic curve showing a variable throttle of a flow rate ratio-setting spool as a relationship between the spool slide stroke and the opening area;
  • FIG. 3 is a sectional view of a conventional flow dividing valve.
  • the valve body 4 has a spool slide hole 7 extending in the axial direction in which the flow rate control spool 6 is inserted to freely slide therein, and a spool slide hole 9 extending in the axial direction in which the flow rate ratio-setting spool 8 is inserted to freely slide therein.
  • the valve body 4 further has an inlet port P communicating with the spool slide hole 7 and with the spool slide hole 9 from the outer side of the valve body 4 , and has an outlet port A and an outlet port B communicating with the spool slide hole 7 .
  • An end (left end in FIG. 1) of the spool slide hole 7 is provided with a fluid chamber 7 a having a diameter larger than the spool slide hole 7 , and an end (left end in FIG.
  • the spool slide hole 9 is provided with a fluid chamber 9 a having a diameter larger than the spool slide hole 9 .
  • the spool slide hole 7 and the spool slide hole 9 are connected together through a fluid passage 4 a .
  • the fluid passage 4 a is further connected to the fluid chamber 7 a through a fluid passage 4 b .
  • the fluid chamber 9 a is open to the drain via a fluid passage 4 c.
  • a signal port S is formed in the cover 12 so as to be communicated with the spool slide hole 9 .
  • the flow rate control spool 6 has a large-diameter land portion 6 a that is caused to slide to open or close the communication with the outlet ports A and B or to adjust the opening area.
  • the flow rate control spool 6 is positioned being pushed against the cover 12 at the other end of the spool slide hole 7 by a compression spring 14 arranged in the fluid chamber 7 a at one end of the spool slide hole 7 (in a state shown in FIG. 1 ). In this state, the large-diameter land portion 6 a laps (closes) over the outlet port A by a lap length L 1 .
  • the lap length L 1 decreases as the flow rate control spool 6 is slid in a direction to compress the compression spring 14 , so that an under lap (open) state is formed.
  • the large-diameter land portion 6 a is in an under lap (open) state to the outlet port B by a lap length L 2 .
  • the lap length L 2 decreases as the flow rate control spool 6 is slid in a direction to compress the compression spring 14 .
  • the lap lengths have a relationship L 1 ⁇ L 2 .
  • a fluid passage 6 b is formed in an end, which comes in contact with the cover 12 , of the flow rate control spool 6 to connect a fluid chamber 7 b formed along the outer periphery of the flow rate control spool 6 to the inlet port P.
  • the flow rate ratio-setting spool 8 has a large-diameter land portion 8 a which is caused to slide to open or close the communication with the fluid passage 4 a connected with the outlet port B and the inlet port P or to adjust the opening area, and a plurality of slots 8 b formed in the large-diameter land portion 8 a .
  • the flow rate ratio-setting spool 8 is positioned being pushed onto the cover 12 at the other end of the spool slide hole 9 by a compression spring 16 arranged in the fluid chamber 9 a at one end of the spool slide hole 9 (in a state shown in FIG. 1 ).
  • the slots 8 b in the large-diameter land portion 8 a do not permit the inlet port P to be communicated with the fluid passage 4 a .
  • the flow rate ratio-setting spool 8 is slid in a direction to compress the compression spring 16 (leftward in FIG. 1) by a pilot hydraulic pressure which is a control signal from the signal port S (the control signal will be described later in detail)
  • the slots 8 b are opened to the fluid passage 4 a and the opening area increases with the sliding amount. That is, a variable throttle is formed by the slots 8 b .
  • the variable throttle is so formed that the opening area Ax of the slots 8 b gradually increases from zero with an increase in the slide stroke L 3 of the flow rate ratio-setting spool 8 , as shown in FIG. 2 .
  • a pilot hydraulic pressure Pp is applied from the signal port S.
  • a pressurized pressure of a hydraulic pressure source is applied through a pressure-reducing valve (not shown) that is so formed as can be freely operated.
  • the pressure-reducing valve makes output by reducing the pressurized fluid from the hydraulic pressure source so as to elevate a pressure from zero up to a pressure corresponding to the operation amount.
  • a manually operated pressure-reducing valve or a solenoid operated pressure-reducing valve can be used.
  • the flow rate ratio-setting spool 8 is caused to slide by the pilot hydraulic pressure Pp of the control signal to a position corresponding to the pressure hereof.
  • Q 0 the flow rate of the fluid flowing into the input port P at the time when the variable throttle 8 b is opened to the fluid passage 4 a
  • Q 1 the flow rate of the fluid flowing through the variable throttle 8 b
  • P 1 and P 2 the pressures before and after the variable throttle 8 b
  • Ax there is established the following expression (1),
  • the pressure P 2 is applied, via the fluid passage 4 b , to the fluid chamber 7 a in which the spring 14 is disposed at one end of the flow rate control spool 6 , and the pressure P 1 is applied to the fluid chamber 7 b at the other end via the fluid passage 6 b in the flow rate control spool 6 .
  • balance of forces in the axial direction of the flow rate control spool 6 is expressed by the following expression (2),
  • ⁇ P 1 pressure difference (P 1 ⁇ P 2 ) before and after the slots 8 b.
  • variable throttle 8 b opens the moment the pressure difference before and after the variable throttle 8 b exceeds ⁇ P 0 according to the expressions (1) to (3), and the fluid flows into the outlet port B.
  • the flow rate Q 1 of the fluid flowing through the variable throttle 8 b is expressed by the following expression (7) irrespective of the pressures in the output port A and in the output port B,
  • the flow rate Q 1 of the fluid flowing through the variable throttle 8 b is maintained constant irrespective of the pressures in the output port A and in the output port B.
  • the opening area A x of the variable throttle 8 b is continuously changed to freely take out the pressure-compensated flow rate from the output port A and the output port B.
  • the flow dividing valve of the present invention is used for an attachment circuit for a hydraulic shovel of a construction machine, the output port B is connected to the attachment circuit and the output port A is connected to the circuit of a standard operation apparatus, so that the pressure-compensated fluid is supplied to both circuits at any desired flow rate that is controlled by the pilot pressure Pp irrespective of the pressures in the circuit of the standard operation apparatus and in the attachment circuit, realizing stabilized operation of the actuators.
  • a pilot hydraulic pressure was used as a control signal for operating the flow rate ratio-setting spool, but the flow rate ratio-setting spool may be operated by the output of the solenoid actuated by an electric signal.
  • the embodiment has dealt with two outlet ports (port A and port B), but the number of the output ports is in no way limited to two.
  • the ratio of flow rates for dividing the fluid in the inlet port into a plurality of output ports can be set instantaneously and continuously.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Sliding Valves (AREA)
  • Control Of Non-Electrical Variables (AREA)
  • Servomotors (AREA)
  • Multiple-Way Valves (AREA)
  • Flow Control (AREA)
  • Safety Valves (AREA)
US09/514,350 1998-08-04 2000-02-28 Flow dividing valve Expired - Fee Related US6371150B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP21950398A JP3404592B2 (ja) 1998-08-04 1998-08-04 分流弁
JP10-219503 1998-08-04

Publications (1)

Publication Number Publication Date
US6371150B1 true US6371150B1 (en) 2002-04-16

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ID=16736481

Family Applications (1)

Application Number Title Priority Date Filing Date
US09/514,350 Expired - Fee Related US6371150B1 (en) 1998-08-04 2000-02-28 Flow dividing valve

Country Status (5)

Country Link
US (1) US6371150B1 (de)
EP (1) EP1035332B1 (de)
JP (1) JP3404592B2 (de)
DE (1) DE69937729T2 (de)
WO (1) WO2000008341A1 (de)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040118083A1 (en) * 2002-12-19 2004-06-24 Delaware Capital Formation, Inc. Clipping mechanism piston actuator
US20080276993A1 (en) * 2004-11-08 2008-11-13 Takeharu Matsuzaki Flow Divider
US8807170B2 (en) 2010-05-27 2014-08-19 Graco Minnesota Inc. Cross-porting configuration for series progressive divider valve
US20150090812A1 (en) * 2013-09-30 2015-04-02 Xiamen Solex High-Tech Industries Co., Ltd. Pilot valve switch mechanism and a combined shower applied with the pilot valve switch mechanism
US20150090813A1 (en) * 2013-09-30 2015-04-02 Xiamen Solex High-Tech Industries Co., Ltd. Pilot valve switch mechanism and a shower system applied with the pilot valve switch mechanism
US20150090811A1 (en) * 2013-09-30 2015-04-02 Xiamen Solex High-Tech Industries Co., Ltd. Combined pilot valve mechanism and a shower system applied with the combined pilot valve mechanism
CN107923550A (zh) * 2016-03-30 2018-04-17 日立建机株式会社 减压阀单元
CN109058206A (zh) * 2018-09-29 2018-12-21 吕伟健 一种液压流量控制器

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007062649A1 (de) 2007-12-24 2009-06-25 Hydac Electronic Gmbh Ventilvorrichtung

Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2868217A (en) * 1955-03-29 1959-01-13 Faisandier Jacques Double circuit hydraulic distributor
US3730206A (en) * 1970-12-17 1973-05-01 Constantin Rauch Flushing valve arrangement for reversible hydrostatic gear mechanisms
US3788339A (en) * 1972-08-18 1974-01-29 Nutron Corp Fluid controlling
JPS5474523A (en) 1977-11-28 1979-06-14 Fujikoshi Kk Distributing and current collecting valve
US4216702A (en) * 1978-05-01 1980-08-12 Eaton Yale Ltd. Pressure sensing regenerative hydraulic system
US4285268A (en) * 1976-01-22 1981-08-25 White Farm Equipment Company Automatic sequencing valve and system
US4616671A (en) * 1984-01-27 1986-10-14 Trw Inc. Valve with flow force compensator
US4712649A (en) * 1985-12-04 1987-12-15 Joseph Vogele Ag Progressive distributor for lubricants
JPS63139302A (ja) 1986-04-22 1988-06-11 Seiko Epson Corp 反射防止膜を有する光学成形物品
US4921072A (en) * 1987-10-19 1990-05-01 Dropsa S.P.A. Modular progressive hydraulic distributor for lubrication systems
JPH0544704A (ja) 1991-03-18 1993-02-23 Akio Oba 作動油の分流装置
US5509391A (en) * 1994-10-03 1996-04-23 Caterpillar Inc. Helmoltz isolation spool valve assembly adapted for a hydraulically-actuated fuel injection system

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
HU187851B (en) * 1983-02-01 1986-02-28 Danuvia Koezponti Szerszam- Es Keszuelekgyar,Hu Hydraulic differential lock with vaiable range of unsensitiveness
DE3327608C2 (de) * 1983-07-30 1985-06-05 Integral Hydraulik & Co, 4000 Düsseldorf Schaltungsanordnung
JPS63139302U (de) * 1987-03-04 1988-09-13
FR2640329A1 (fr) * 1988-12-13 1990-06-15 Bennes Marrel Dispositif hydraulique de repartition a regulation de debit et vehicule d'epandage le comportant

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2868217A (en) * 1955-03-29 1959-01-13 Faisandier Jacques Double circuit hydraulic distributor
US3730206A (en) * 1970-12-17 1973-05-01 Constantin Rauch Flushing valve arrangement for reversible hydrostatic gear mechanisms
US3788339A (en) * 1972-08-18 1974-01-29 Nutron Corp Fluid controlling
US4285268A (en) * 1976-01-22 1981-08-25 White Farm Equipment Company Automatic sequencing valve and system
JPS5474523A (en) 1977-11-28 1979-06-14 Fujikoshi Kk Distributing and current collecting valve
US4216702A (en) * 1978-05-01 1980-08-12 Eaton Yale Ltd. Pressure sensing regenerative hydraulic system
US4616671A (en) * 1984-01-27 1986-10-14 Trw Inc. Valve with flow force compensator
US4712649A (en) * 1985-12-04 1987-12-15 Joseph Vogele Ag Progressive distributor for lubricants
JPS63139302A (ja) 1986-04-22 1988-06-11 Seiko Epson Corp 反射防止膜を有する光学成形物品
US4921072A (en) * 1987-10-19 1990-05-01 Dropsa S.P.A. Modular progressive hydraulic distributor for lubrication systems
JPH0544704A (ja) 1991-03-18 1993-02-23 Akio Oba 作動油の分流装置
US5509391A (en) * 1994-10-03 1996-04-23 Caterpillar Inc. Helmoltz isolation spool valve assembly adapted for a hydraulically-actuated fuel injection system

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
English Abstract of JP 63-139302.

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040118083A1 (en) * 2002-12-19 2004-06-24 Delaware Capital Formation, Inc. Clipping mechanism piston actuator
US20080276993A1 (en) * 2004-11-08 2008-11-13 Takeharu Matsuzaki Flow Divider
US7784494B2 (en) * 2004-11-08 2010-08-31 Kabushiki Kaisha Toyota Jidoshokki Flow divider
US9339897B2 (en) 2010-05-27 2016-05-17 Graco Minnesota Inc. Bypass piston port and methods of manufacturing a bypass piston port for a series progressive divider valve
US9062783B2 (en) 2010-05-27 2015-06-23 Graco Minnesota Inc. Piston bore undercut and methods of manufacturing a piston bore undercut for a series progressive divider valve
US8939176B2 (en) 2010-05-27 2015-01-27 Graco Minnesota Inc. Piston bores and methods of manufacturing piston bores for a series progressive divider valve
US8960236B2 (en) 2010-05-27 2015-02-24 Graco Minnesota Inc. Bypass piston port and methods of manufacturing a bypass piston port for a series progressive divider valve
US8887767B2 (en) 2010-05-27 2014-11-18 Graco Minnesota Inc. Double-sealed cross-port fitting for series progressive divider valve
US8807170B2 (en) 2010-05-27 2014-08-19 Graco Minnesota Inc. Cross-porting configuration for series progressive divider valve
AU2011258889B2 (en) * 2010-05-27 2015-06-25 Graco Minnesota Inc. Piston bore undercut and methods of manufacturing a piston bore undercut for a series progressive divider valve
US20150090812A1 (en) * 2013-09-30 2015-04-02 Xiamen Solex High-Tech Industries Co., Ltd. Pilot valve switch mechanism and a combined shower applied with the pilot valve switch mechanism
US20150090811A1 (en) * 2013-09-30 2015-04-02 Xiamen Solex High-Tech Industries Co., Ltd. Combined pilot valve mechanism and a shower system applied with the combined pilot valve mechanism
US20150090813A1 (en) * 2013-09-30 2015-04-02 Xiamen Solex High-Tech Industries Co., Ltd. Pilot valve switch mechanism and a shower system applied with the pilot valve switch mechanism
US9585526B2 (en) * 2013-09-30 2017-03-07 Xiamen Solex High-Tech Industries Co., Ltd. Pilot valve switch mechanism and a shower system applied with the pilot valve switch mechanism
US9587383B2 (en) * 2013-09-30 2017-03-07 Xiamen Solex High-Tech Industries Co., Ltd. Pilot valve switch mechanism and a combined shower applied with the pilot valve switch mechanism
US9615697B2 (en) * 2013-09-30 2017-04-11 Xiamen Solex High-Tech Industries Co., Ltd. Combined pilot valve mechanism and a shower system applied with the combined pilot valve mechanism
CN107923550A (zh) * 2016-03-30 2018-04-17 日立建机株式会社 减压阀单元
CN107923550B (zh) * 2016-03-30 2019-09-27 日立建机株式会社 减压阀单元
CN109058206A (zh) * 2018-09-29 2018-12-21 吕伟健 一种液压流量控制器

Also Published As

Publication number Publication date
EP1035332A1 (de) 2000-09-13
JP2000055218A (ja) 2000-02-22
DE69937729T2 (de) 2008-11-27
EP1035332B1 (de) 2007-12-12
JP3404592B2 (ja) 2003-05-12
WO2000008341A1 (fr) 2000-02-17
DE69937729D1 (de) 2008-01-24
EP1035332A4 (de) 2006-02-08

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